linux-kernel - Re: [PATCH v3 03/10] ata: pata_of_platform: Use platform_get_irq

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Date:   Sat, 25 Dec 2021 19:01:24 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>, linux-ide@...r.kernel.org
Subject: Re: [PATCH v3 03/10] ata: pata_of_platform: Use platform_get_irq_optional()
 to get the interrupt

On Sat, Dec 25, 2021 at 3:55 AM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
>
> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> allocation of IRQ resources in DT core code, this causes an issue
> when using hierarchical interrupt domains using "interrupts" property
> in the node as this bypasses the hierarchical setup and messes up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional().

...

> +       irq = platform_get_irq_optional(ofdev, 0);
> +       if (irq < 0 && irq != -ENXIO)
> +               return irq;
> +
> +       if (irq > 0) {

> +               memset(&irq_res, 0x0, sizeof(struct resource));

Why do you need that variable at all?

0x0 -> 0
sizeof(irq_res)

> +               irq_res.start = irq;
> +       }

-- 
With Best Regards,
Andy Shevchenko